Liner coating composition



Patented Dec. 24, 1946 LINER COATING COMPOSITION Alfred A. Srere,Dayton, Ohio, assignor to The Miami Valley Coated Paper 00., Franklin,

Ohio

No Drawing. Application March 27, 1944, Serial No. 528,3.65

2 Claims. 1

This invention relates to a coated liner for packaging purposes.

In the packaging of various articles or materials, such as articles ormaterial in fluid, semifluid, or plastic condition, particularly wherethe articles or material have adhesive characteristics, it is verydesirable that the material of which the package or container is made beso formed and of such characteristic that the contents will not only notpenetrate r adhere to the container but also that the fibers of thecontainer will be prevented from penetrating and adhering to thecontents. The presence of fibers or foreign material in certain packagedmaterial, such as synthetic rubber has a tendency to subsequently causeair pockets or accelerate deterioration of the manufactured product.

It is therefore an object of this invention to provide a coating orliner which can be applied to the inside of a fibrous container andwhich is so formulated that the contents will not penetrate the walls ofthe container, and the coating will also prevent any fibers of thecontainer from adhering to the contents, and becoming separated from thecontainer, penetrate into the contents and subsequently injuriouslyaffecting the manufactured product.

Another object of this invention is to provide a coating for the insideof a containe in which the coating may adhere to the contents andsubsequently become amalgamated with the manufactured product withoutinjury to the product.

A further object of this invention is to provide a coating which is ofsuch composition that the ingredients thereof may be varied withinpredetermined limits so that the coating may be adapted to variousproducts.

A further object of this-invention is to provide a coating which willpermit the use of paper or fibrous bags or cartons for material havingan .adhesive characteristic, thereby eliminating the necessity ofshipping the material, such as synthetic rubber, asphalt, gums, resinsor the like, in metal, wooden or plastic containers, and also reducingthe packaging cost of such material. The coating stripping clean willprevent particles or pieces of the container from being separated fromthe container and thereby not only injuriously afiecting the materialand product formed therefrom, but also preventing clogging of pipes,strainers, valves or the like when the material is put in a fluidcondition.

A coating adapted fo coating the interior of a container, such as apaper bag, carton or other fibrous material, is formulated from finetalc, kaolin, protein, caustic soda, plasticizer and water. Theseingredients are mixed inthe following manner and proportions:

Fine talc pounds 1,600 Kaolin do 400 Protein do 220 Caustic soda do 11Plasticizer gallons 3 Water do 380 For plasticizing purposes glycerine,dextrine, syrup or molasses is used or a combination of these productsor similar materials will serve.

The mixture of the ingredients is accomplished as follows: The fine talcand kaolin are initially mixed together with about 250 gallons of waterfor a period of about one hour. The protein and caustic soda are mixedtogether with about gallons of water at a temperature of about F. for aperiod of about two and one-half to three hours. The second mixture isthen added to the composite mixture during the final mixing period toprovide flexibility to the coating or liner.

The plasticizer provides a degree of flexibility to the finished productso that the coating will not crack off from the container during theordinary handling of converting into a bag or carton. The completemixture has a watery consistency, so as to render easy the applicationof the coating to the container.

A coating adapted for use in packaging asphalt is formulated from thefollowing ingredients in the proportions indicated:

Fine talc pounds 1,000 Bentonite do 220 Plasticizer gallons 6 Water do2'75 The tale and bentonite are mixed together for a period of thirty toforty-five minutes, and then plasticizer solution is added and mixingoperation continued for a period of one and one-half to two hours atroom or atmospheric temperature. The completed mixture has a wateryconsistency.

Another coating adapted for use in packaging asphalt is formulated fromthe following ingredients in the proportion indicated:

Kaolin pounds 1,200 Casein do.. 60 Protein do 40 Plasticizer gallons 6Water do 260 The above ingredients are mixed together in a single mixingoperation covering a period of one and one-half to two hours. Theglycerine and/or other plasticlzer provide plasticizing elements forFlne talc "pounds" 600 Kaolin do 600 Protein do 178 Plasticizer gallons6 Water do 225 The tale and kaolin are mixed with water for one to oneand one-half hours. A solution of protein and plasticizer are then addedto the mix and the Whole mixed together for a period of from one andone-half to two hours. The consistency of the complete mixture iswatery.

As an example of protein for use with the examples herein given, edestinor similar vegetable protein may be used with this composition.

The coating hereinbefore described is applied to the container in anysuitable manner, such as by brush coating, roll coating, spray coatingor the like. The drying of the applied coating may be accomplished byatmosphere, heat, forced drying in a draft of air or passing the coatedcontainer over festoons.

I 70% talc, 18%

The adhesive used in the several examples herelnbefore described aresuch that they will not penetrate the fibers of the container to such anextent as to cause pulling of the fibers or tearing of the containerwhen the contents are removed therefrom. Where the contents stick to thecoating or plastic liner, the latter will be removed either entirely orpartially with the contents, coating the exterior of the contents andsubsequently mixing without injurious results with the contents when thelatter are made fluid and later formed into a solid or partially solidproduct. In other words, the adhesive capacity of the coating or lineris less than the adhesive characteristic of the contents, so that thecoating or liner will peel from the container in such a manner that nofibers or parts of the container will adhere to the coating.

What I claim is:

1. A coated liner for application to the interior of a fibrous packageconsisting of the following ingredients in the proportions stated: Talc1600 lbs., kaolin 400 lbs., protein 220 lbs., caustic soda 11 lbs.,glycerine 3 gallons, water 380 gallons.

2. A liner coating composition for application to the interior of afibrous package consisting of kaoline, 10% protein and 2% caustic sodain a mixture of glycerine and water.

ALFRED A. SRERE.

